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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "UrlClassifierFeatureTrackingProtection.h"
#include "mozilla/AntiTrackingUtils.h"
#include "mozilla/net/UrlClassifierCommon.h"
#include "ChannelClassifierService.h"
#include "nsIChannel.h"
#include "nsIHttpChannelInternal.h"
#include "nsILoadContext.h"
#include "nsNetUtil.h"
#include "mozilla/StaticPtr.h"
#include "nsXULAppAPI.h"
#include "nsIWebProgressListener.h"
namespace mozilla {
namespace net {
namespace {
#define TRACKING_PROTECTION_FEATURE_NAME "tracking-protection"
#define URLCLASSIFIER_TRACKING_BLOCKLIST "urlclassifier.trackingTable"
#define URLCLASSIFIER_TRACKING_BLOCKLIST_TEST_ENTRIES \
"urlclassifier.trackingTable.testEntries"
#define URLCLASSIFIER_TRACKING_ENTITYLIST "urlclassifier.trackingWhitelistTable"
#define URLCLASSIFIER_TRACKING_ENTITYLIST_TEST_ENTRIES \
"urlclassifier.trackingWhitelistTable.testEntries"
#define URLCLASSIFIER_TRACKING_PROTECTION_EXCEPTION_URLS \
"urlclassifier.trackingSkipURLs"
#define TABLE_TRACKING_BLOCKLIST_PREF "tracking-blocklist-pref"
#define TABLE_TRACKING_ENTITYLIST_PREF "tracking-entitylist-pref"
StaticRefPtr<UrlClassifierFeatureTrackingProtection> gFeatureTrackingProtection;
} // namespace
UrlClassifierFeatureTrackingProtection::UrlClassifierFeatureTrackingProtection()
: UrlClassifierFeatureAntiTrackingBase(
nsLiteralCString(TRACKING_PROTECTION_FEATURE_NAME),
nsLiteralCString(URLCLASSIFIER_TRACKING_BLOCKLIST),
nsLiteralCString(URLCLASSIFIER_TRACKING_ENTITYLIST),
nsLiteralCString(URLCLASSIFIER_TRACKING_BLOCKLIST_TEST_ENTRIES),
nsLiteralCString(URLCLASSIFIER_TRACKING_ENTITYLIST_TEST_ENTRIES),
nsLiteralCString(TABLE_TRACKING_BLOCKLIST_PREF),
nsLiteralCString(TABLE_TRACKING_ENTITYLIST_PREF),
nsLiteralCString(URLCLASSIFIER_TRACKING_PROTECTION_EXCEPTION_URLS)) {}
/* static */ const char* UrlClassifierFeatureTrackingProtection::Name() {
return TRACKING_PROTECTION_FEATURE_NAME;
}
/* static */
void UrlClassifierFeatureTrackingProtection::MaybeInitialize() {
MOZ_ASSERT(XRE_IsParentProcess());
UC_LOG_LEAK(("UrlClassifierFeatureTrackingProtection::MaybeInitialize"));
if (!gFeatureTrackingProtection) {
gFeatureTrackingProtection = new UrlClassifierFeatureTrackingProtection();
gFeatureTrackingProtection->InitializePreferences();
}
}
/* static */
void UrlClassifierFeatureTrackingProtection::MaybeShutdown() {
UC_LOG_LEAK(("UrlClassifierFeatureTrackingProtection::MaybeShutdown"));
if (gFeatureTrackingProtection) {
gFeatureTrackingProtection->ShutdownPreferences();
gFeatureTrackingProtection = nullptr;
}
}
/* static */
already_AddRefed<UrlClassifierFeatureTrackingProtection>
UrlClassifierFeatureTrackingProtection::MaybeCreate(nsIChannel* aChannel) {
MOZ_ASSERT(aChannel);
UC_LOG_LEAK(
("UrlClassifierFeatureTrackingProtection::MaybeCreate - channel %p",
aChannel));
nsCOMPtr<nsILoadContext> loadContext;
NS_QueryNotificationCallbacks(aChannel, loadContext);
if (!loadContext) {
// Some channels don't have a loadcontext, check the global tracking
// protection preference.
if (!StaticPrefs::privacy_trackingprotection_enabled() &&
!(NS_UsePrivateBrowsing(aChannel) &&
StaticPrefs::privacy_trackingprotection_pbmode_enabled())) {
return nullptr;
}
} else if (!loadContext->UseTrackingProtection()) {
return nullptr;
}
bool isThirdParty = AntiTrackingUtils::IsThirdPartyChannel(aChannel);
if (!isThirdParty) {
UC_LOG(
("UrlClassifierFeatureTrackingProtection::MaybeCreate - "
"skipping first party or top-level load for channel %p",
aChannel));
return nullptr;
}
if (!UrlClassifierCommon::ShouldEnableProtectionForChannel(aChannel)) {
return nullptr;
}
MaybeInitialize();
MOZ_ASSERT(gFeatureTrackingProtection);
RefPtr<UrlClassifierFeatureTrackingProtection> self =
gFeatureTrackingProtection;
return self.forget();
}
/* static */
already_AddRefed<nsIUrlClassifierFeature>
UrlClassifierFeatureTrackingProtection::GetIfNameMatches(
const nsACString& aName) {
if (!aName.EqualsLiteral(TRACKING_PROTECTION_FEATURE_NAME)) {
return nullptr;
}
MaybeInitialize();
MOZ_ASSERT(gFeatureTrackingProtection);
RefPtr<UrlClassifierFeatureTrackingProtection> self =
gFeatureTrackingProtection;
return self.forget();
}
NS_IMETHODIMP
UrlClassifierFeatureTrackingProtection::ProcessChannel(
nsIChannel* aChannel, const nsTArray<nsCString>& aList,
const nsTArray<nsCString>& aHashes, bool* aShouldContinue) {
NS_ENSURE_ARG_POINTER(aChannel);
NS_ENSURE_ARG_POINTER(aShouldContinue);
bool isAllowListed = UrlClassifierCommon::IsAllowListed(aChannel);
// This is a blocking feature.
*aShouldContinue = isAllowListed;
if (isAllowListed) {
return NS_OK;
}
nsAutoCString list;
UrlClassifierCommon::TablesToString(aList, list);
ChannelBlockDecision decision =
ChannelClassifierService::OnBeforeBlockChannel(aChannel, mName, list);
if (decision != ChannelBlockDecision::Blocked) {
uint32_t event =
decision == ChannelBlockDecision::Replaced
? nsIWebProgressListener::STATE_REPLACED_TRACKING_CONTENT
: nsIWebProgressListener::STATE_ALLOWED_TRACKING_CONTENT;
// Need to set aBlocked to True if we replace the Tracker with a shim,
// since the shim is treated as a blocked event
// Note: If we need to account for which kind of tracker was replaced,
// we need to create a new event type in nsIWebProgressListener
if (event == nsIWebProgressListener::STATE_REPLACED_TRACKING_CONTENT) {
ContentBlockingNotifier::OnEvent(aChannel, event, true);
} else {
ContentBlockingNotifier::OnEvent(aChannel, event, false);
}
*aShouldContinue = true;
return NS_OK;
}
UrlClassifierCommon::SetBlockedContent(aChannel, NS_ERROR_TRACKING_URI, list,
""_ns, ""_ns);
UC_LOG(
("UrlClassifierFeatureTrackingProtection::ProcessChannel - "
"cancelling channel %p",
aChannel));
nsCOMPtr<nsIHttpChannelInternal> httpChannel = do_QueryInterface(aChannel);
if (httpChannel) {
Unused << httpChannel->CancelByURLClassifier(NS_ERROR_TRACKING_URI);
} else {
Unused << aChannel->Cancel(NS_ERROR_TRACKING_URI);
}
return NS_OK;
}
NS_IMETHODIMP
UrlClassifierFeatureTrackingProtection::GetURIByListType(
nsIChannel* aChannel, nsIUrlClassifierFeature::listType aListType,
nsIUrlClassifierFeature::URIType* aURIType, nsIURI** aURI) {
NS_ENSURE_ARG_POINTER(aChannel);
NS_ENSURE_ARG_POINTER(aURIType);
NS_ENSURE_ARG_POINTER(aURI);
if (aListType == nsIUrlClassifierFeature::blocklist) {
*aURIType = nsIUrlClassifierFeature::blocklistURI;
return aChannel->GetURI(aURI);
}
MOZ_ASSERT(aListType == nsIUrlClassifierFeature::entitylist);
*aURIType = nsIUrlClassifierFeature::pairwiseEntitylistURI;
return UrlClassifierCommon::CreatePairwiseEntityListURI(aChannel, aURI);
}
} // namespace net
} // namespace mozilla
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